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138.520 spans is about one-and-one-fifth times as long as Baseball base distances
In other words, it's 1.1543 times the length of Baseball base distances, and the length of Baseball base distances is 0.86633 times that amount.
(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 120 spans. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.
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